Improvement in curtain-fixtures



anni sain @anni I (time WILLIAM cfcnovnn, Or BROOKLYN, NEW YORK,AssIcNOn TO HENRY n CLOVE'R. OF VSAME PLACE.

Letters Patent No. 108,761, dated November 1, 1870.

IMPROVEMENT iN CURTAIN-FIXTURES.

' The Schedule'refened to these Letters Patent and making 'part of theBme.

I, WILLIAM O. CLovEn, of Brooklyn, in the county of Kings and State ofNew York, have invented an Improved Window-Shade, Pulley, of which thefollowing' is a speciition.

Nature and Object of the Invention.

My invention relates to the combination of a'sliding bridge, spiralspring, and nut, confined to a vertical set-screw, the whole securedupon a plate in such a manner that, by turning the screw by athumb-piece, the bridge 1s caused to traverse the screw.

vThe object of the invention is so to secure'the cord that it may belengtheued or shorteneduniformly, and firmly secured -from shifting ordisplacement, at the same time the effect of the spiral spring isto'compensate for the atmospheric contraction or expansion of the cord.

Y Description of the Accompanying Drawing.

Figure 1, front elevation of the machine embodying Figure 2, side viewofthe same.

Figure 3, raised metal plate, to which the combination above referred tois secured by projecting flanges at each end.

Generaal Description. A, screw secured to the plate at each end byanges, and passing through the bridge, the spiral-Wire spring, and thenut. f

B, raised metal plate, with molded edges and pro-v jectiu'ganges,comprising thebody of the machine. G, sliding 'bridge secured to thescrew, and having a grooved wheel upon its face.

D, slot iu the plate, to guide the nut. E, revolving grooved wheel,secured at its axis upon the face of the bridge. 1

F, thumb-piece ot' screw.

G, projecting flanges at the ends of the plate, which I secures thescrew to the plate.

AII nut at upper end of screw, which, by action of the screw, is drawndown upon the spring, which, in

.its turn, is forced upon the bridge to which the wheel holding theclord is attached. ByY turning the screw' the cord is contracted orlengtheued, as required.

X X,`spiralwire spring; the vupper end confined by the nut, the lowerend bearing upon the bridge, giving it an easy pressure.

I. do not claim the movable screwand nut, nor-wire spring, as` appliedto window-shade pulleys.

Claim.

I claim for my inven tion- The set-screw and sliding bridge-wheel, incombination with the nut and wire spring', as and for the purposehereinbefore set forth. WILLIAM O. OLOVER. Witnesses:

. FRANK OLovEn,

HENRY'E. OLOvnn.

